The dehydration recovery test (test_auto_save_recovers_when_save_leaves_
board_dehydrated) builds a KiCADInterface via __new__, skipping __init__.
After #173 was rebased onto the #151/#172 auto-save guard, _auto_save_board
reads self._board_disk_signature (the content-hash conflict guard), which
__init__ normally sets to None. The fixture didn't, so the test tripped an
AttributeError before reaching the recovery logic it exercises.
Initialise _board_disk_signature = None in the _make_iface helper, matching
the pattern already used in test_auto_save_guard.py. Test-only change.
Co-authored-by: mixelpixx <11727006+mixelpixx@users.noreply.github.com>
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